Fix memory leak at rime_candidate_copy. https://github.com/rime/home/issues/94
Fix memory leak at rime_candidate_copy. https://github.com/rime/home/issues/94

kionz/librime,rime/librime,rime/librime,Prcuvu/librime,kionz/librime,Prcuvu/librime,kionz/librime,rime/librime,rime/librime,kionz/librime,Prcuvu/librime,Prcuvu/librime,Prcuvu/librime